生物滴滤塔处理苯乙烯气流的工效和生物膜微群落的分析

Performance and biofilm microcommunity of biotrickling filter treating styrene-polluted gaseous streams

采用培养驯化污泥菌种、类球形陶粒和循环液等构建生物滴滤塔。研究评价气体苯乙烯浓度、气体流量、循环液喷淋量对生物滴滤塔工效的影响,并对生物膜微群落中的微种群作了定性定量检测。当进口气体苯乙烯小于1 000 mg/m3、气体流量为200 L/h、循环液流量为10 L/h时,苯乙烯净化效率达90%以上,生化去除量为30 mg/(L.h);单位体积生物膜填料对苯乙烯的最大生化去除量为35 mg/(L.h)。湿润生物膜微群落的优势菌种群包括恶臭假单胞菌、梭形芽孢杆菌、罗非氏不动杆菌等5种,恶臭假单胞菌等非芽孢杆菌的最大活菌数为5.5×107CFU/g,并随生物滴滤塔运行时间延长有减少趋势。

Build biotrickling filter（BTF） treating styrene-polluted gaseous streams using the enriched sludge bacteria, perlite and liquid medium flow. The experimental data of styrene concentration in the gaseous stream, gas velocity, liquid flow in circtit were used to evaluate the influence of styrene loading on BTF performance. When the concentration of styrene was below 1 000 mg/m^3 , the gas flow was 200 L/h and the liquid flow was 10 L/h, the styrene removal efficiency could be arrived at 90% and elimination capacity was 30 mg/（L · h）. The maximal volumetric styrene elimination capacity could come up to 35 mg/（L · h）. The dominant micropopulations in moist biofilm include Pseudornonas putida, Bacillus fusiformis, Acinetobacter lwoffii, etc. The maximal living bacterial cells of Pseudomonas putida whin biofilm was 5.5 × 10^7 CFU/g, and the living cells decreased with increasing duration of biotrickling filter operating period.